COPY: Photosynthesis Experiments

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Questions and Answers

Why is it essential to destarch a plant before conducting an experiment to demonstrate photosynthesis?

To remove any pre-existing starch, so only newly synthesized starch from the experiment is measured. (correct)
To prevent the plant from producing oxygen during the experiment.
To ensure the plant does not absorb water during the experiment.
To make the leaves more transparent for better light absorption.

During photosynthesis, light energy is converted into __________ energy stored in glucose.

chemical

In an experiment testing the rate of photosynthesis, what is the main factor being tested if light intensity is the variable?

The amount of chlorophyll in the leaves.
The rate of oxygen production.
The effect of light intensity on the rate of photosynthesis. (correct)
The concentration of carbon dioxide available.

The chemical used to test for the presence of starch in a leaf is __________.

iodine solution Signup and view all the answers

Boiling a leaf in water during the starch test primarily serves to extract chlorophyll.

False (B) Signup and view all the answers

Explain why alcohol turns green when a leaf is heated in it during the starch test for photosynthesis.

The alcohol turns green because it extracts the chlorophyll from the leaf. Signup and view all the answers

A potted plant with one of its leaves partially covered with aluminum foil is placed under sunlight. After several hours, the leaf is removed, boiled, treated with alcohol, and tested with iodine solution. If only the uncovered part turns blue-black, what conclusion can be drawn?

Light is necessary for photosynthesis to produce starch. (C) Signup and view all the answers

How does the light intensity experiment relate to the concept of limiting factors in photosynthesis?

The light intensity experiment demonstrates that the rate of photosynthesis increases with light intensity only up to a certain point. Beyond that point, light is no longer the limiting factor, and increasing it further does not increase the rate. Another factor, such as carbon dioxide concentration or temperature, becomes the limiting factor. Signup and view all the answers

Flashcards

Why destarch a plant?

To remove any pre-existing starch so only newly synthesized starch from the experiment is measured.

Energy conversion in photosynthesis

Light energy is converted into chemical energy (glucose).